| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops. |
| * |
| * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> |
| * |
| * Hwmon integration: |
| * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> |
| * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net> |
| * Copyright (C) 2014, 2015 Pali Rohár <pali.rohar@gmail.com> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/cpu.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/init.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/dmi.h> |
| #include <linux/capability.h> |
| #include <linux/mutex.h> |
| #include <linux/hwmon.h> |
| #include <linux/hwmon-sysfs.h> |
| #include <linux/uaccess.h> |
| #include <linux/io.h> |
| #include <linux/sched.h> |
| #include <linux/ctype.h> |
| #include <linux/smp.h> |
| |
| #include <linux/i8k.h> |
| |
| #define I8K_SMM_FN_STATUS 0x0025 |
| #define I8K_SMM_POWER_STATUS 0x0069 |
| #define I8K_SMM_SET_FAN 0x01a3 |
| #define I8K_SMM_GET_FAN 0x00a3 |
| #define I8K_SMM_GET_SPEED 0x02a3 |
| #define I8K_SMM_GET_FAN_TYPE 0x03a3 |
| #define I8K_SMM_GET_NOM_SPEED 0x04a3 |
| #define I8K_SMM_GET_TEMP 0x10a3 |
| #define I8K_SMM_GET_TEMP_TYPE 0x11a3 |
| #define I8K_SMM_GET_DELL_SIG1 0xfea3 |
| #define I8K_SMM_GET_DELL_SIG2 0xffa3 |
| |
| #define I8K_FAN_MULT 30 |
| #define I8K_FAN_MAX_RPM 30000 |
| #define I8K_MAX_TEMP 127 |
| |
| #define I8K_FN_NONE 0x00 |
| #define I8K_FN_UP 0x01 |
| #define I8K_FN_DOWN 0x02 |
| #define I8K_FN_MUTE 0x04 |
| #define I8K_FN_MASK 0x07 |
| #define I8K_FN_SHIFT 8 |
| |
| #define I8K_POWER_AC 0x05 |
| #define I8K_POWER_BATTERY 0x01 |
| |
| static DEFINE_MUTEX(i8k_mutex); |
| static char bios_version[4]; |
| static char bios_machineid[16]; |
| static struct device *i8k_hwmon_dev; |
| static u32 i8k_hwmon_flags; |
| static uint i8k_fan_mult = I8K_FAN_MULT; |
| static uint i8k_pwm_mult; |
| static uint i8k_fan_max = I8K_FAN_HIGH; |
| static bool disallow_fan_type_call; |
| static bool disallow_fan_support; |
| static unsigned int manual_fan; |
| static unsigned int auto_fan; |
| |
| #define I8K_HWMON_HAVE_TEMP1 (1 << 0) |
| #define I8K_HWMON_HAVE_TEMP2 (1 << 1) |
| #define I8K_HWMON_HAVE_TEMP3 (1 << 2) |
| #define I8K_HWMON_HAVE_TEMP4 (1 << 3) |
| #define I8K_HWMON_HAVE_TEMP5 (1 << 4) |
| #define I8K_HWMON_HAVE_TEMP6 (1 << 5) |
| #define I8K_HWMON_HAVE_TEMP7 (1 << 6) |
| #define I8K_HWMON_HAVE_TEMP8 (1 << 7) |
| #define I8K_HWMON_HAVE_TEMP9 (1 << 8) |
| #define I8K_HWMON_HAVE_TEMP10 (1 << 9) |
| #define I8K_HWMON_HAVE_FAN1 (1 << 10) |
| #define I8K_HWMON_HAVE_FAN2 (1 << 11) |
| #define I8K_HWMON_HAVE_FAN3 (1 << 12) |
| |
| MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); |
| MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); |
| MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("i8k"); |
| |
| static bool force; |
| module_param(force, bool, 0); |
| MODULE_PARM_DESC(force, "Force loading without checking for supported models"); |
| |
| static bool ignore_dmi; |
| module_param(ignore_dmi, bool, 0); |
| MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); |
| |
| #if IS_ENABLED(CONFIG_I8K) |
| static bool restricted = true; |
| module_param(restricted, bool, 0); |
| MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); |
| |
| static bool power_status; |
| module_param(power_status, bool, 0600); |
| MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); |
| #endif |
| |
| static uint fan_mult; |
| module_param(fan_mult, uint, 0); |
| MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); |
| |
| static uint fan_max; |
| module_param(fan_max, uint, 0); |
| MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); |
| |
| struct smm_regs { |
| unsigned int eax; |
| unsigned int ebx __packed; |
| unsigned int ecx __packed; |
| unsigned int edx __packed; |
| unsigned int esi __packed; |
| unsigned int edi __packed; |
| }; |
| |
| static inline const char *i8k_get_dmi_data(int field) |
| { |
| const char *dmi_data = dmi_get_system_info(field); |
| |
| return dmi_data && *dmi_data ? dmi_data : "?"; |
| } |
| |
| /* |
| * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. |
| */ |
| static int i8k_smm_func(void *par) |
| { |
| int rc; |
| struct smm_regs *regs = par; |
| int eax = regs->eax; |
| |
| #ifdef DEBUG |
| int ebx = regs->ebx; |
| unsigned long duration; |
| ktime_t calltime, delta, rettime; |
| |
| calltime = ktime_get(); |
| #endif |
| |
| /* SMM requires CPU 0 */ |
| if (smp_processor_id() != 0) |
| return -EBUSY; |
| |
| #if defined(CONFIG_X86_64) |
| asm volatile("pushq %%rax\n\t" |
| "movl 0(%%rax),%%edx\n\t" |
| "pushq %%rdx\n\t" |
| "movl 4(%%rax),%%ebx\n\t" |
| "movl 8(%%rax),%%ecx\n\t" |
| "movl 12(%%rax),%%edx\n\t" |
| "movl 16(%%rax),%%esi\n\t" |
| "movl 20(%%rax),%%edi\n\t" |
| "popq %%rax\n\t" |
| "out %%al,$0xb2\n\t" |
| "out %%al,$0x84\n\t" |
| "xchgq %%rax,(%%rsp)\n\t" |
| "movl %%ebx,4(%%rax)\n\t" |
| "movl %%ecx,8(%%rax)\n\t" |
| "movl %%edx,12(%%rax)\n\t" |
| "movl %%esi,16(%%rax)\n\t" |
| "movl %%edi,20(%%rax)\n\t" |
| "popq %%rdx\n\t" |
| "movl %%edx,0(%%rax)\n\t" |
| "pushfq\n\t" |
| "popq %%rax\n\t" |
| "andl $1,%%eax\n" |
| : "=a"(rc) |
| : "a"(regs) |
| : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); |
| #else |
| asm volatile("pushl %%eax\n\t" |
| "movl 0(%%eax),%%edx\n\t" |
| "push %%edx\n\t" |
| "movl 4(%%eax),%%ebx\n\t" |
| "movl 8(%%eax),%%ecx\n\t" |
| "movl 12(%%eax),%%edx\n\t" |
| "movl 16(%%eax),%%esi\n\t" |
| "movl 20(%%eax),%%edi\n\t" |
| "popl %%eax\n\t" |
| "out %%al,$0xb2\n\t" |
| "out %%al,$0x84\n\t" |
| "xchgl %%eax,(%%esp)\n\t" |
| "movl %%ebx,4(%%eax)\n\t" |
| "movl %%ecx,8(%%eax)\n\t" |
| "movl %%edx,12(%%eax)\n\t" |
| "movl %%esi,16(%%eax)\n\t" |
| "movl %%edi,20(%%eax)\n\t" |
| "popl %%edx\n\t" |
| "movl %%edx,0(%%eax)\n\t" |
| "lahf\n\t" |
| "shrl $8,%%eax\n\t" |
| "andl $1,%%eax\n" |
| : "=a"(rc) |
| : "a"(regs) |
| : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); |
| #endif |
| if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) |
| rc = -EINVAL; |
| |
| #ifdef DEBUG |
| rettime = ktime_get(); |
| delta = ktime_sub(rettime, calltime); |
| duration = ktime_to_ns(delta) >> 10; |
| pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, |
| (rc ? 0xffff : regs->eax & 0xffff), duration); |
| #endif |
| |
| return rc; |
| } |
| |
| /* |
| * Call the System Management Mode BIOS. |
| */ |
| static int i8k_smm(struct smm_regs *regs) |
| { |
| int ret; |
| |
| get_online_cpus(); |
| ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); |
| put_online_cpus(); |
| |
| return ret; |
| } |
| |
| /* |
| * Read the fan status. |
| */ |
| static int i8k_get_fan_status(int fan) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; |
| |
| if (disallow_fan_support) |
| return -EINVAL; |
| |
| regs.ebx = fan & 0xff; |
| return i8k_smm(®s) ? : regs.eax & 0xff; |
| } |
| |
| /* |
| * Read the fan speed in RPM. |
| */ |
| static int i8k_get_fan_speed(int fan) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; |
| |
| if (disallow_fan_support) |
| return -EINVAL; |
| |
| regs.ebx = fan & 0xff; |
| return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; |
| } |
| |
| /* |
| * Read the fan type. |
| */ |
| static int _i8k_get_fan_type(int fan) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; |
| |
| if (disallow_fan_support || disallow_fan_type_call) |
| return -EINVAL; |
| |
| regs.ebx = fan & 0xff; |
| return i8k_smm(®s) ? : regs.eax & 0xff; |
| } |
| |
| static int i8k_get_fan_type(int fan) |
| { |
| /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ |
| static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; |
| |
| if (types[fan] == INT_MIN) |
| types[fan] = _i8k_get_fan_type(fan); |
| |
| return types[fan]; |
| } |
| |
| /* |
| * Read the fan nominal rpm for specific fan speed. |
| */ |
| static int i8k_get_fan_nominal_speed(int fan, int speed) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; |
| |
| if (disallow_fan_support) |
| return -EINVAL; |
| |
| regs.ebx = (fan & 0xff) | (speed << 8); |
| return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; |
| } |
| |
| /* |
| * Enable or disable automatic BIOS fan control support |
| */ |
| static int i8k_enable_fan_auto_mode(bool enable) |
| { |
| struct smm_regs regs = { }; |
| |
| if (disallow_fan_support) |
| return -EINVAL; |
| |
| regs.eax = enable ? auto_fan : manual_fan; |
| return i8k_smm(®s); |
| } |
| |
| /* |
| * Set the fan speed (off, low, high). Returns the new fan status. |
| */ |
| static int i8k_set_fan(int fan, int speed) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; |
| |
| if (disallow_fan_support) |
| return -EINVAL; |
| |
| speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); |
| regs.ebx = (fan & 0xff) | (speed << 8); |
| |
| return i8k_smm(®s) ? : i8k_get_fan_status(fan); |
| } |
| |
| static int i8k_get_temp_type(int sensor) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; |
| |
| regs.ebx = sensor & 0xff; |
| return i8k_smm(®s) ? : regs.eax & 0xff; |
| } |
| |
| /* |
| * Read the cpu temperature. |
| */ |
| static int _i8k_get_temp(int sensor) |
| { |
| struct smm_regs regs = { |
| .eax = I8K_SMM_GET_TEMP, |
| .ebx = sensor & 0xff, |
| }; |
| |
| return i8k_smm(®s) ? : regs.eax & 0xff; |
| } |
| |
| static int i8k_get_temp(int sensor) |
| { |
| int temp = _i8k_get_temp(sensor); |
| |
| /* |
| * Sometimes the temperature sensor returns 0x99, which is out of range. |
| * In this case we retry (once) before returning an error. |
| # 1003655137 00000058 00005a4b |
| # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees |
| # 1003655139 00000054 00005c52 |
| */ |
| if (temp == 0x99) { |
| msleep(100); |
| temp = _i8k_get_temp(sensor); |
| } |
| /* |
| * Return -ENODATA for all invalid temperatures. |
| * |
| * Known instances are the 0x99 value as seen above as well as |
| * 0xc1 (193), which may be returned when trying to read the GPU |
| * temperature if the system supports a GPU and it is currently |
| * turned off. |
| */ |
| if (temp > I8K_MAX_TEMP) |
| return -ENODATA; |
| |
| return temp; |
| } |
| |
| static int i8k_get_dell_signature(int req_fn) |
| { |
| struct smm_regs regs = { .eax = req_fn, }; |
| int rc; |
| |
| rc = i8k_smm(®s); |
| if (rc < 0) |
| return rc; |
| |
| return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; |
| } |
| |
| #if IS_ENABLED(CONFIG_I8K) |
| |
| /* |
| * Read the Fn key status. |
| */ |
| static int i8k_get_fn_status(void) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; |
| int rc; |
| |
| rc = i8k_smm(®s); |
| if (rc < 0) |
| return rc; |
| |
| switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { |
| case I8K_FN_UP: |
| return I8K_VOL_UP; |
| case I8K_FN_DOWN: |
| return I8K_VOL_DOWN; |
| case I8K_FN_MUTE: |
| return I8K_VOL_MUTE; |
| default: |
| return 0; |
| } |
| } |
| |
| /* |
| * Read the power status. |
| */ |
| static int i8k_get_power_status(void) |
| { |
| struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; |
| int rc; |
| |
| rc = i8k_smm(®s); |
| if (rc < 0) |
| return rc; |
| |
| return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; |
| } |
| |
| /* |
| * Procfs interface |
| */ |
| |
| static int |
| i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) |
| { |
| int val = 0; |
| int speed; |
| unsigned char buff[16]; |
| int __user *argp = (int __user *)arg; |
| |
| if (!argp) |
| return -EINVAL; |
| |
| switch (cmd) { |
| case I8K_BIOS_VERSION: |
| if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || |
| !isdigit(bios_version[2])) |
| return -EINVAL; |
| |
| val = (bios_version[0] << 16) | |
| (bios_version[1] << 8) | bios_version[2]; |
| break; |
| |
| case I8K_MACHINE_ID: |
| if (restricted && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| memset(buff, 0, sizeof(buff)); |
| strlcpy(buff, bios_machineid, sizeof(buff)); |
| break; |
| |
| case I8K_FN_STATUS: |
| val = i8k_get_fn_status(); |
| break; |
| |
| case I8K_POWER_STATUS: |
| val = i8k_get_power_status(); |
| break; |
| |
| case I8K_GET_TEMP: |
| val = i8k_get_temp(0); |
| break; |
| |
| case I8K_GET_SPEED: |
| if (copy_from_user(&val, argp, sizeof(int))) |
| return -EFAULT; |
| |
| val = i8k_get_fan_speed(val); |
| break; |
| |
| case I8K_GET_FAN: |
| if (copy_from_user(&val, argp, sizeof(int))) |
| return -EFAULT; |
| |
| val = i8k_get_fan_status(val); |
| break; |
| |
| case I8K_SET_FAN: |
| if (restricted && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| if (copy_from_user(&val, argp, sizeof(int))) |
| return -EFAULT; |
| |
| if (copy_from_user(&speed, argp + 1, sizeof(int))) |
| return -EFAULT; |
| |
| val = i8k_set_fan(val, speed); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| if (val < 0) |
| return val; |
| |
| switch (cmd) { |
| case I8K_BIOS_VERSION: |
| if (copy_to_user(argp, &val, 4)) |
| return -EFAULT; |
| |
| break; |
| case I8K_MACHINE_ID: |
| if (copy_to_user(argp, buff, 16)) |
| return -EFAULT; |
| |
| break; |
| default: |
| if (copy_to_user(argp, &val, sizeof(int))) |
| return -EFAULT; |
| |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
| { |
| long ret; |
| |
| mutex_lock(&i8k_mutex); |
| ret = i8k_ioctl_unlocked(fp, cmd, arg); |
| mutex_unlock(&i8k_mutex); |
| |
| return ret; |
| } |
| |
| /* |
| * Print the information for /proc/i8k. |
| */ |
| static int i8k_proc_show(struct seq_file *seq, void *offset) |
| { |
| int fn_key, cpu_temp, ac_power; |
| int left_fan, right_fan, left_speed, right_speed; |
| |
| cpu_temp = i8k_get_temp(0); /* 11100 µs */ |
| left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ |
| right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ |
| left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ |
| right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ |
| fn_key = i8k_get_fn_status(); /* 750 µs */ |
| if (power_status) |
| ac_power = i8k_get_power_status(); /* 14700 µs */ |
| else |
| ac_power = -1; |
| |
| /* |
| * Info: |
| * |
| * 1) Format version (this will change if format changes) |
| * 2) BIOS version |
| * 3) BIOS machine ID |
| * 4) Cpu temperature |
| * 5) Left fan status |
| * 6) Right fan status |
| * 7) Left fan speed |
| * 8) Right fan speed |
| * 9) AC power |
| * 10) Fn Key status |
| */ |
| seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", |
| I8K_PROC_FMT, |
| bios_version, |
| (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, |
| cpu_temp, |
| left_fan, right_fan, left_speed, right_speed, |
| ac_power, fn_key); |
| |
| return 0; |
| } |
| |
| static int i8k_open_fs(struct inode *inode, struct file *file) |
| { |
| return single_open(file, i8k_proc_show, NULL); |
| } |
| |
| static const struct proc_ops i8k_proc_ops = { |
| .proc_open = i8k_open_fs, |
| .proc_read = seq_read, |
| .proc_lseek = seq_lseek, |
| .proc_release = single_release, |
| .proc_ioctl = i8k_ioctl, |
| }; |
| |
| static void __init i8k_init_procfs(void) |
| { |
| /* Register the proc entry */ |
| proc_create("i8k", 0, NULL, &i8k_proc_ops); |
| } |
| |
| static void __exit i8k_exit_procfs(void) |
| { |
| remove_proc_entry("i8k", NULL); |
| } |
| |
| #else |
| |
| static inline void __init i8k_init_procfs(void) |
| { |
| } |
| |
| static inline void __exit i8k_exit_procfs(void) |
| { |
| } |
| |
| #endif |
| |
| /* |
| * Hwmon interface |
| */ |
| |
| static ssize_t i8k_hwmon_temp_label_show(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| static const char * const labels[] = { |
| "CPU", |
| "GPU", |
| "SODIMM", |
| "Other", |
| "Ambient", |
| "Other", |
| }; |
| int index = to_sensor_dev_attr(devattr)->index; |
| int type; |
| |
| type = i8k_get_temp_type(index); |
| if (type < 0) |
| return type; |
| if (type >= ARRAY_SIZE(labels)) |
| type = ARRAY_SIZE(labels) - 1; |
| return sprintf(buf, "%s\n", labels[type]); |
| } |
| |
| static ssize_t i8k_hwmon_temp_show(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| int index = to_sensor_dev_attr(devattr)->index; |
| int temp; |
| |
| temp = i8k_get_temp(index); |
| if (temp < 0) |
| return temp; |
| return sprintf(buf, "%d\n", temp * 1000); |
| } |
| |
| static ssize_t i8k_hwmon_fan_label_show(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| static const char * const labels[] = { |
| "Processor Fan", |
| "Motherboard Fan", |
| "Video Fan", |
| "Power Supply Fan", |
| "Chipset Fan", |
| "Other Fan", |
| }; |
| int index = to_sensor_dev_attr(devattr)->index; |
| bool dock = false; |
| int type; |
| |
| type = i8k_get_fan_type(index); |
| if (type < 0) |
| return type; |
| |
| if (type & 0x10) { |
| dock = true; |
| type &= 0x0F; |
| } |
| |
| if (type >= ARRAY_SIZE(labels)) |
| type = (ARRAY_SIZE(labels) - 1); |
| |
| return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); |
| } |
| |
| static ssize_t i8k_hwmon_fan_show(struct device *dev, |
| struct device_attribute *devattr, char *buf) |
| { |
| int index = to_sensor_dev_attr(devattr)->index; |
| int fan_speed; |
| |
| fan_speed = i8k_get_fan_speed(index); |
| if (fan_speed < 0) |
| return fan_speed; |
| return sprintf(buf, "%d\n", fan_speed); |
| } |
| |
| static ssize_t i8k_hwmon_pwm_show(struct device *dev, |
| struct device_attribute *devattr, char *buf) |
| { |
| int index = to_sensor_dev_attr(devattr)->index; |
| int status; |
| |
| status = i8k_get_fan_status(index); |
| if (status < 0) |
| return -EIO; |
| return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); |
| } |
| |
| static ssize_t i8k_hwmon_pwm_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int index = to_sensor_dev_attr(attr)->index; |
| unsigned long val; |
| int err; |
| |
| err = kstrtoul(buf, 10, &val); |
| if (err) |
| return err; |
| val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); |
| |
| mutex_lock(&i8k_mutex); |
| err = i8k_set_fan(index, val); |
| mutex_unlock(&i8k_mutex); |
| |
| return err < 0 ? -EIO : count; |
| } |
| |
| static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int err; |
| bool enable; |
| unsigned long val; |
| |
| if (!auto_fan) |
| return -ENODEV; |
| |
| err = kstrtoul(buf, 10, &val); |
| if (err) |
| return err; |
| |
| if (val == 1) |
| enable = false; |
| else if (val == 2) |
| enable = true; |
| else |
| return -EINVAL; |
| |
| mutex_lock(&i8k_mutex); |
| err = i8k_enable_fan_auto_mode(enable); |
| mutex_unlock(&i8k_mutex); |
| |
| return err ? err : count; |
| } |
| |
| static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0); |
| static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0); |
| static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1); |
| static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1); |
| static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2); |
| static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2); |
| static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3); |
| static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3); |
| static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4); |
| static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4); |
| static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5); |
| static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5); |
| static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6); |
| static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6); |
| static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7); |
| static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7); |
| static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8); |
| static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8); |
| static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9); |
| static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9); |
| static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0); |
| static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0); |
| static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0); |
| static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0); |
| static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1); |
| static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1); |
| static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1); |
| static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2); |
| static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2); |
| static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2); |
| |
| static struct attribute *i8k_attrs[] = { |
| &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ |
| &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ |
| &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ |
| &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ |
| &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ |
| &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ |
| &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ |
| &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ |
| &sensor_dev_attr_temp5_input.dev_attr.attr, /* 8 */ |
| &sensor_dev_attr_temp5_label.dev_attr.attr, /* 9 */ |
| &sensor_dev_attr_temp6_input.dev_attr.attr, /* 10 */ |
| &sensor_dev_attr_temp6_label.dev_attr.attr, /* 11 */ |
| &sensor_dev_attr_temp7_input.dev_attr.attr, /* 12 */ |
| &sensor_dev_attr_temp7_label.dev_attr.attr, /* 13 */ |
| &sensor_dev_attr_temp8_input.dev_attr.attr, /* 14 */ |
| &sensor_dev_attr_temp8_label.dev_attr.attr, /* 15 */ |
| &sensor_dev_attr_temp9_input.dev_attr.attr, /* 16 */ |
| &sensor_dev_attr_temp9_label.dev_attr.attr, /* 17 */ |
| &sensor_dev_attr_temp10_input.dev_attr.attr, /* 18 */ |
| &sensor_dev_attr_temp10_label.dev_attr.attr, /* 19 */ |
| &sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */ |
| &sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */ |
| &sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */ |
| &sensor_dev_attr_pwm1_enable.dev_attr.attr, /* 23 */ |
| &sensor_dev_attr_fan2_input.dev_attr.attr, /* 24 */ |
| &sensor_dev_attr_fan2_label.dev_attr.attr, /* 25 */ |
| &sensor_dev_attr_pwm2.dev_attr.attr, /* 26 */ |
| &sensor_dev_attr_fan3_input.dev_attr.attr, /* 27 */ |
| &sensor_dev_attr_fan3_label.dev_attr.attr, /* 28 */ |
| &sensor_dev_attr_pwm3.dev_attr.attr, /* 29 */ |
| NULL |
| }; |
| |
| static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, |
| int index) |
| { |
| if (disallow_fan_support && index >= 8) |
| return 0; |
| if (disallow_fan_type_call && |
| (index == 9 || index == 12 || index == 15)) |
| return 0; |
| if (index >= 0 && index <= 1 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) |
| return 0; |
| if (index >= 2 && index <= 3 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) |
| return 0; |
| if (index >= 4 && index <= 5 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) |
| return 0; |
| if (index >= 6 && index <= 7 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) |
| return 0; |
| if (index >= 8 && index <= 9 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5)) |
| return 0; |
| if (index >= 10 && index <= 11 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6)) |
| return 0; |
| if (index >= 12 && index <= 13 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7)) |
| return 0; |
| if (index >= 14 && index <= 15 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8)) |
| return 0; |
| if (index >= 16 && index <= 17 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9)) |
| return 0; |
| if (index >= 18 && index <= 19 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10)) |
| return 0; |
| |
| if (index >= 20 && index <= 23 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) |
| return 0; |
| if (index >= 24 && index <= 26 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) |
| return 0; |
| if (index >= 27 && index <= 29 && |
| !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) |
| return 0; |
| |
| if (index == 23 && !auto_fan) |
| return 0; |
| |
| return attr->mode; |
| } |
| |
| static const struct attribute_group i8k_group = { |
| .attrs = i8k_attrs, |
| .is_visible = i8k_is_visible, |
| }; |
| __ATTRIBUTE_GROUPS(i8k); |
| |
| static int __init i8k_init_hwmon(void) |
| { |
| int err; |
| |
| i8k_hwmon_flags = 0; |
| |
| /* CPU temperature attributes, if temperature type is OK */ |
| err = i8k_get_temp_type(0); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; |
| /* check for additional temperature sensors */ |
| err = i8k_get_temp_type(1); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; |
| err = i8k_get_temp_type(2); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; |
| err = i8k_get_temp_type(3); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; |
| err = i8k_get_temp_type(4); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5; |
| err = i8k_get_temp_type(5); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6; |
| err = i8k_get_temp_type(6); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7; |
| err = i8k_get_temp_type(7); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8; |
| err = i8k_get_temp_type(8); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9; |
| err = i8k_get_temp_type(9); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10; |
| |
| /* First fan attributes, if fan status or type is OK */ |
| err = i8k_get_fan_status(0); |
| if (err < 0) |
| err = i8k_get_fan_type(0); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; |
| |
| /* Second fan attributes, if fan status or type is OK */ |
| err = i8k_get_fan_status(1); |
| if (err < 0) |
| err = i8k_get_fan_type(1); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; |
| |
| /* Third fan attributes, if fan status or type is OK */ |
| err = i8k_get_fan_status(2); |
| if (err < 0) |
| err = i8k_get_fan_type(2); |
| if (err >= 0) |
| i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; |
| |
| i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", |
| NULL, i8k_groups); |
| if (IS_ERR(i8k_hwmon_dev)) { |
| err = PTR_ERR(i8k_hwmon_dev); |
| i8k_hwmon_dev = NULL; |
| pr_err("hwmon registration failed (%d)\n", err); |
| return err; |
| } |
| return 0; |
| } |
| |
| struct i8k_config_data { |
| uint fan_mult; |
| uint fan_max; |
| }; |
| |
| enum i8k_configs { |
| DELL_LATITUDE_D520, |
| DELL_PRECISION_490, |
| DELL_STUDIO, |
| DELL_XPS, |
| }; |
| |
| static const struct i8k_config_data i8k_config_data[] = { |
| [DELL_LATITUDE_D520] = { |
| .fan_mult = 1, |
| .fan_max = I8K_FAN_TURBO, |
| }, |
| [DELL_PRECISION_490] = { |
| .fan_mult = 1, |
| .fan_max = I8K_FAN_TURBO, |
| }, |
| [DELL_STUDIO] = { |
| .fan_mult = 1, |
| .fan_max = I8K_FAN_HIGH, |
| }, |
| [DELL_XPS] = { |
| .fan_mult = 1, |
| .fan_max = I8K_FAN_HIGH, |
| }, |
| }; |
| |
| static const struct dmi_system_id i8k_dmi_table[] __initconst = { |
| { |
| .ident = "Dell Inspiron", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), |
| }, |
| }, |
| { |
| .ident = "Dell Latitude", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), |
| }, |
| }, |
| { |
| .ident = "Dell Inspiron 2", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), |
| }, |
| }, |
| { |
| .ident = "Dell Latitude D520", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), |
| }, |
| .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], |
| }, |
| { |
| .ident = "Dell Latitude 2", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), |
| }, |
| }, |
| { /* UK Inspiron 6400 */ |
| .ident = "Dell Inspiron 3", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), |
| }, |
| }, |
| { |
| .ident = "Dell Inspiron 3", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), |
| }, |
| }, |
| { |
| .ident = "Dell Precision 490", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, |
| "Precision WorkStation 490"), |
| }, |
| .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], |
| }, |
| { |
| .ident = "Dell Precision", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), |
| }, |
| }, |
| { |
| .ident = "Dell Vostro", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), |
| }, |
| }, |
| { |
| .ident = "Dell XPS421", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), |
| }, |
| }, |
| { |
| .ident = "Dell Studio", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), |
| }, |
| .driver_data = (void *)&i8k_config_data[DELL_STUDIO], |
| }, |
| { |
| .ident = "Dell XPS 13", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), |
| }, |
| .driver_data = (void *)&i8k_config_data[DELL_XPS], |
| }, |
| { |
| .ident = "Dell XPS M140", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), |
| }, |
| .driver_data = (void *)&i8k_config_data[DELL_XPS], |
| }, |
| { |
| .ident = "Dell XPS 15 9560", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"), |
| }, |
| }, |
| { |
| .ident = "Dell XPS 15 9570", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"), |
| }, |
| }, |
| { } |
| }; |
| |
| MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); |
| |
| /* |
| * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed |
| * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist |
| * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. |
| * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 |
| */ |
| static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { |
| { |
| .ident = "Dell Studio XPS 8000", |
| .matches = { |
| DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), |
| }, |
| }, |
| { |
| .ident = "Dell Studio XPS 8100", |
| .matches = { |
| DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), |
| }, |
| }, |
| { |
| .ident = "Dell Inspiron 580", |
| .matches = { |
| DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), |
| }, |
| }, |
| { } |
| }; |
| |
| /* |
| * On some machines all fan related SMM functions implemented by Dell BIOS |
| * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan |
| * support for affected blacklisted Dell machines stay disabled. |
| * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 |
| */ |
| static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = { |
| { |
| .ident = "Dell Inspiron 7720", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), |
| }, |
| }, |
| { |
| .ident = "Dell Vostro 3360", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), |
| }, |
| }, |
| { |
| .ident = "Dell XPS13 9333", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"), |
| }, |
| }, |
| { } |
| }; |
| |
| struct i8k_fan_control_data { |
| unsigned int manual_fan; |
| unsigned int auto_fan; |
| }; |
| |
| enum i8k_fan_controls { |
| I8K_FAN_34A3_35A3, |
| }; |
| |
| static const struct i8k_fan_control_data i8k_fan_control_data[] = { |
| [I8K_FAN_34A3_35A3] = { |
| .manual_fan = 0x34a3, |
| .auto_fan = 0x35a3, |
| }, |
| }; |
| |
| static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = { |
| { |
| .ident = "Dell Precision 5530", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"), |
| }, |
| .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
| }, |
| { |
| .ident = "Dell Latitude E6440", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"), |
| }, |
| .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
| }, |
| { } |
| }; |
| |
| /* |
| * Probe for the presence of a supported laptop. |
| */ |
| static int __init i8k_probe(void) |
| { |
| const struct dmi_system_id *id, *fan_control; |
| int fan, ret; |
| |
| /* |
| * Get DMI information |
| */ |
| if (!dmi_check_system(i8k_dmi_table)) { |
| if (!ignore_dmi && !force) |
| return -ENODEV; |
| |
| pr_info("not running on a supported Dell system.\n"); |
| pr_info("vendor=%s, model=%s, version=%s\n", |
| i8k_get_dmi_data(DMI_SYS_VENDOR), |
| i8k_get_dmi_data(DMI_PRODUCT_NAME), |
| i8k_get_dmi_data(DMI_BIOS_VERSION)); |
| } |
| |
| if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { |
| pr_warn("broken Dell BIOS detected, disallow fan support\n"); |
| if (!force) |
| disallow_fan_support = true; |
| } |
| |
| if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { |
| pr_warn("broken Dell BIOS detected, disallow fan type call\n"); |
| if (!force) |
| disallow_fan_type_call = true; |
| } |
| |
| strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), |
| sizeof(bios_version)); |
| strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), |
| sizeof(bios_machineid)); |
| |
| /* |
| * Get SMM Dell signature |
| */ |
| if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && |
| i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { |
| pr_err("unable to get SMM Dell signature\n"); |
| if (!force) |
| return -ENODEV; |
| } |
| |
| /* |
| * Set fan multiplier and maximal fan speed from dmi config |
| * Values specified in module parameters override values from dmi |
| */ |
| id = dmi_first_match(i8k_dmi_table); |
| if (id && id->driver_data) { |
| const struct i8k_config_data *conf = id->driver_data; |
| if (!fan_mult && conf->fan_mult) |
| fan_mult = conf->fan_mult; |
| if (!fan_max && conf->fan_max) |
| fan_max = conf->fan_max; |
| } |
| |
| i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ |
| i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); |
| |
| fan_control = dmi_first_match(i8k_whitelist_fan_control); |
| if (fan_control && fan_control->driver_data) { |
| const struct i8k_fan_control_data *data = fan_control->driver_data; |
| |
| manual_fan = data->manual_fan; |
| auto_fan = data->auto_fan; |
| pr_info("enabling support for setting automatic/manual fan control\n"); |
| } |
| |
| if (!fan_mult) { |
| /* |
| * Autodetect fan multiplier based on nominal rpm |
| * If fan reports rpm value too high then set multiplier to 1 |
| */ |
| for (fan = 0; fan < 2; ++fan) { |
| ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); |
| if (ret < 0) |
| continue; |
| if (ret > I8K_FAN_MAX_RPM) |
| i8k_fan_mult = 1; |
| break; |
| } |
| } else { |
| /* Fan multiplier was specified in module param or in dmi */ |
| i8k_fan_mult = fan_mult; |
| } |
| |
| return 0; |
| } |
| |
| static int __init i8k_init(void) |
| { |
| int err; |
| |
| /* Are we running on an supported laptop? */ |
| if (i8k_probe()) |
| return -ENODEV; |
| |
| err = i8k_init_hwmon(); |
| if (err) |
| return err; |
| |
| i8k_init_procfs(); |
| return 0; |
| } |
| |
| static void __exit i8k_exit(void) |
| { |
| hwmon_device_unregister(i8k_hwmon_dev); |
| i8k_exit_procfs(); |
| } |
| |
| module_init(i8k_init); |
| module_exit(i8k_exit); |